Preparation and characterization of fouling-resistant photocatalytic metal membrane embedded with self-organized TiO2 nano tube

Abstract

A self-organized nano-structured, photocatalytic TiO₂ membrane with large surface area of anatase crystallites was successfully fabricated by anodization. The nano-structured anodized TiO₂ membrane was characterized using SEM, XRD and TEM techniques and the operational parameters to fabricate such as anodization time and applied anodic potential were also investigated. The anodized TiO₂ membrane showed high photocatalytic performance in terms of refractory organics decomposition, bacteria inactivation and membrane permeability, which suggests that problems of conventional photocatalytic treatment and membrane filtration in water and wastewater treatment may be reduced using this combined process.

Porous Substoichiometric TiO2 Anodes as Reactive Electrochemical Membranes for Water Treatment

“…The integration of membrane and advanced oxidation process (AOP) technologies into a single reactive membrane unit has many potential applications in water treatment and could be useful in increasing the efficiency of water recycling. Current approaches include depositing a TiO 2 photocatalyst on a membrane surface, − and using conductive porous electrodes. − Using a TiO 2 photocatalyst on a membrane surface requires UV light to oxidize water to hydroxyl radicals (OH • ). − While these studies were successful at the lab-scale, the placement of UV lamps around membranes would result in potentially high capital cost and a large reactor footprint. Additionally, the high absorption of UV in water also increases the cost of photocatalytic treatment.…”

Photocatalytical and antibacterial activity of TiO2 nanoparticles obtained by laser ablation in water

“…Several methods have been developed for the realization of nanostructured titanium oxide membranes or films for developing very efficient photocatalytic filters for water purification [8]. These nanomaterials may be composed of nanofibers, nanotubes or nanoparticles [9][10][11][12][13][14], employing a variety of techniques such as plasma spray [15], anodization [16] and hydrothermal growth [17].…”

Hybrid Ultrafiltration/Photocatalytic Membranes for Efficient Water Treatment

“…Several methods have been recently developed and optimized for the manufacturing of titania based photocatalytic membranes. Among them are dip coating, or spin coating of porous supports using TiO 2 precursor sols, the filtration of TiO 2 nanofibers through glass filters followed by hot pressing or liquid phase pressurization, the hydrothermal growth of free-standing TiO 2 nanowire membranes, the anodization of titanium films sputtered on to stainless steel substrates, the embedment of TiO 2 nanoparticles into the matrix of polymeric membranes, either electrospun fibers, or flat membranes prepared by recasting, the development of TiO 2 layers with rapid atmospheric plasma spray coating, and the fabrication of free-standing and flow through TiO 2 nanotube membranes. − In most of the above studies the photocatalytic activity of the membranes was evaluated in batch experiments and methyl orange (MO) ,,, or methylene blue (MB) ,,,, were applied as the model pollutants. Pharmaceuticals, humic acid, , and other dyes such as reactive black 5 (RB5) and RGB have also been tested.…”